[Mike Madonna]

Did you see my reply to your post on SCOF regarding the throttle? If not, check the bushing where the accelerator pedal linkage comes out of the footbox. This will expand a little when hot. Give it a couple of shots of Silicone spray, that should help. As for jetting, my 750 Vac. carb (according to Holley) has 72 primaries. Your Mech. 750 may have had the same. Check Holley's site, they have a chart that shows what installed at the factory regarding jetting and power valve. My plugs are a little sooty/black. I believe this is due to the choke during the colder weather. Just a little food for thought....

Mike